Free chain hoist



April 13 {1926.

F. w. COFFI NG Fair's CHAIN HOIST Filed Ai lgust I, 1924 INVENTOR. five-puck W. (MN v.

, ATTORNEYS clear, and exact description thereof, referstep by step ra1sing and lowering'of. a load in theaconstruction of the several v-in the-'arran ement of the s eve control andoperatmg'mechamsm newand useful Free ,ence being tively opera-b in the arrangement of thehousing iorzthe' ,chain and the and air-enclosed gear chamber.

- position for continuous rat c ment as will'be out morespecilically in the. rovision of M g-th same. I

, I 15 1 E'SI PATENT OFFICE.

Patented A pr. I 13', 1926.,

UNITED STAT 'rminaxcx w. con-me,

I rnnmrsvmm, INDIANA.

I an: errant nors'r.

Appncation' fledAug'ust 1, 1924. -'Seria1 ,No. 728,490- A To all whom it may concem: A

. Be it known that I, Fnem'ucx W. OOFFING, a citizen of the United States, and a resident of Perrysv ille, county of Vermilion, and State of Indiana, have invented. a certain Chain Hoist; and I do hereby declare that the following is a full,

claims: T In the drawin s Fig. 1 is a side elevational view of one-hal illustrating in'detaili Fig. 2 is a side elevation of the hoist including the lever ha dle with parts broken. away to show other irarts in detail.

had to the accompanyingdraw 'ings, in which like numerals refer, to like par o I This invention relates to .a chain hoist of Fig. I

the free chain type, adaptable. for selective an a portion of the gearing with. Fig. 4' is a view similar to Fig.1 and through achain. I v The chief object of the invention isto construct a hoist of a character that is adapted to have suflicient strength to sustain 'fe.

similar to ig. 4 and. illustrates the parts in another position,

v The chief-featureof the'inventiofi consists Xbutment 13 and anarcuate I parts of has, a mouth 15. 'Associated with therarcuthe free chain hoist whereby they are com.-. atepo pactly arranged, few in number,-and.selection'16 which constitutesthesprocketchame. I her. A shaft :17 is pivotally supported in Another feature of. the invention the housing and carries a sprocket pinion-18 parts adapted to engage simul- Thefabntment 13 causes e teeth. scribe arc'urve and thus,

whereb thee ainiscausedtoe '1 taneo yat least two-or more of I I I k of the gear wheel actuating or moving said Fig.- 1, causes two of the teeth on the sprzocket chaih. pinion 18 to the 'links-of -the chain Ialge the invention consists 19, therebydivi ing the chain. amongthe two teeth. It; will bereadilyobserved that 'thean" enclosed Another feature of r wheel in two zcomple arts w ich form. a relatively closed 'structed chain chain 19' liesin and and mm I I 'imately from endto endof. body In addition thereto said'hou' is adapt-y. 'ti on Herein the upper end I I ed. to rotatably-support a. supporti' hook: shown ,II'O'VldBd with a stove bolt 20 that and asuitable mechanism'is associa the '-p tween the s1 de link'sf'fand' thejtwo with for securing said hook in" aiiyone' of pins'defininganghpeilfigfi, a .idholtcaror rnnmrsvmm, mnrnu, vassienon 'ro o'rrowanrnn, or

3 is an elevational view'of the handle associatedthereof the gear portion thereof. Fig. is a view the links of the chain 19. the chain 19 to deasjshown'cleaa'ly in I no I of thechain' construction I I certain parts and .with a portion hereof in section to illustrate other Parts In the drawings indicates an elongated 4 portion lwliich tively heavy loads and operable in a relachannel which has an. inclined wall 11 and tivelysimple manner. an outlet 12. '-The channel also includes an rtion*14 is a substantially circular porthe load 1 substantially free channel: extending approx- I r-'. .ofthecha'in is 1 a plurality of predetermined posit1oria'- I r i'es a nut '21.' I andnutconstru'e- Another feature-of the inventionfoons' t1on thus ltioned acts ,as prefvent additionalmovement- 0f the c' am thru in the? provisionof 'mean's' wh ereby certain parts are, mam med in a..-

phshed.

hereinaften- I I I Another feature of the invention consists, channel 101s formed by 1 portion'oom- I I a lever or actuatin'g -hans two hal 'ves wh ch are -d I dlewluch includes a" unitary housing-ode tand'iaomg; peripheral: fl n I edto protect or partially suitale- Sa d-flanges22aresu1tab ys ecuredto'gether by. means-.of;-the'screw boltea'nd' nuts 23 and Q, mp y Wi t e with the gear wheel aiidior controiling lforego' redetermined the housing until said stop is removed from 'eting imoye t hecha in which can very -"As showndang in rigs-i aniFhfthe' A hook 27 has enlargements 28 and 29 spaced by a neck 30 seatable in the neck 26. The

body portion supports a plunger 31 having a stem 32 about which is coiled a spring 33 for normally forcing said plunger inwardly. A handle or finger piece 34 is positioned exteriorly of the casing and is adapted to retract the plunger 31 in opposition to the spring 33 and permit free rotation of the hook 27. When it is desired'to secure the hook 27 in any one of a plurality of predetermined positions, the finger piece 34 is released and the plunger 31 is projected inwardly to engage one of the notches carried by the enlargement 29. Thus the hook 27 is secured in thedesired rotativeposition.

Reference will now be had to the several figures and particularly'those portions there of which illustrate the actuating and control mechanism for actuating and controlling the sprocket pinion 18 mounted in the chamber 16- upon shaft 17 Concentric with the bearing receiving the shaft 17 there is provided a stationary ratchet 36 which herein is shown recessed or cut away as of 37. Oscillatably mounted upon the shaft 17 and closing said recess'or chamber 37 is a plate 38 having formed upon its periphery ratchet teeth which are adapted to register with the ratchetteeth 36 or be slightly offset therefrom. Upon the extended end of the shaft 17 there is suitably secured as by being keyed, or the like, a driving ratchet 39. The ratchet 39 is reduced and forms a. bearing portion 40. A lever or handle construction consists of a gradually tapering channel 41,

' which includes a tubular bearing portion 42 rotatably supported upon the bearing portion 40 and secured in position by a retaining plate 43 and nut 44 upon the reduced and threaded end'45 of the shaft 17. A shoulder 46 (see Fig. 2) is adapted to anchor the foregoing construction in associated relationship upon the housing.

Pivotally supported by the channelshaped lever or handle at 46' .is a dog or latching member 47 having a locking tooth 48, which tooth is adapted to engage the teeth of the ratchet/36 and also the teeth of 7 will be had hereinafter to the further relative movement of theratchets 36 and 38v and the locking tooth 48. v

The handle 41 also pivotally supports 8.

lever 51 connected by a link rod 52 which is sli'dably associated with an ear 53 carried by a dog or pawl 54 pivotally supported at 55 by the lever or handle 41. A spring 56 is secured in coiled position by a retainer 57 carried by the rod 52. Spring 56, therefore, is interposed between the projection or car 53 and the retainer 57. Actuation of the lever 51,. therefore, is-adapted to disengage through the action of spring 56 the pawl 54 from the sprocket pinion 39, like wise overrunning of the pawl with respect to said sprocket is permitted by reason of this spring connection.

Pivotally supported in the chamber 16 (see Figs. 1, 4 and 5) is a dog 60 which has a locking face 61. Said dog is normally maintained in position to engage one of the teeth of the pinion 18 by. a spring 62 having its free ends positioned in recesses 63 and.

64 formed in the dog and the housing respectively. When the lever or handle 41 is,

moved arcuately and in the direction of the arrow, as shownin Fig. 3, the detent or dog 54 engages a tooth of sprocket 39 and the shaft 17 is rotated. Rotation of shaft 17 carries with it the pinion 18 and this in turn the camming tooth by reason of spring 62.'

This action continues so long as the handle movement is continued'in the direction indicated by the arrow in Fig. 3.

Upon reverse movement of the handle it will be apparent that the dog 54 overruns the ratchet 39. Upon such reverse movement the load, however, acting through the pinion-18 causes, a tooth thereof to engage the face of the locking dog 60 and thus hold the pinion against reverse rotational movement and thereby support said load in the .elevated position. From the foregoing,

therefore, it will be understood that .the free chain hoist may operate in elevating the load with one, two or'more ratchet teeth ad vancement at each operation of the lever.

Reverse or lowering movement is as follows: The plate 38 covering chamber 37 includes a lateral projection 70 and this projection 70 carries a pin 71 which is engaged bya spring 72 positioned within the chamber 37. The wall between chamber 16 and chamber '37 is provided with an arcuate opening 73 and a portion of said extension 72 asses through said arcuate opening and limits the rotational movement of theplate 38 to that defined by the arcuate-opening.

\The extending end of the projection 72 is adapted to en age an ear or projection 74 earned by a 0g or detent 60. The action in opposition to is as follows: Upon the initial reverse movement of the handle the tooth 48 engages the adjacent teeth uponthe ratchets 36 and 38 and causes said ratchet teeth to register. Such registration retracts the pin 72 from the lowermost position into its uppermost position in opposition to spring 72. This permits dog in chamber 16 to engage the adjacent pinion tooth and take the load, said dog being maintained in this osition by the spring 62. Withthe load t us sustained, the lever is reversely rotated and again positioned with the tooth 54 engaging one of the teeth of the ratchet 39.

The load is thereupon transferred to the handle by the actuatmg mechanism including the dog 47 and the load islowered .as

. the lever is turned. Actuatio'n of lever- 50 during the reversinilplr repositioning of the lever 41 permits loc g tooth 60 to hold the load while the .lever is being repositioned withrespect to the ratchet 39. After repositioning-the lever 50 is released which permits the plate 38 to be repositioned under influence of spring 72 and at the same time removes the locking dog 60 from locking engagement, thereby throwing the load into the handle instead of onto the housing. Reverse movement of the handle thereupon will permit the load to lower the chain by permitting the rotation of the sprocket as the handle is actuated. It will be noted that the release or lowering movement may be in varying amounts for one or more teeth on the ratchet 39 if desired.

Pivotally supported at 80 in the housin is a locking lever 81 having finger engageaile portion 82 and a locking portion 83. Said locking portion 83- isso associated with the aforementioned mechanism that actuation of I the s ame through the lever 50 is not'required in the lifting movementof the chain when the lockin lever '81 is positioned as shown in Fig. 4. ig. 5- shows the same parts in the released position, that is in the inoperable position. It will be noted that lever 81 is so arranged that'when placed in the position shown in Fig. 4- locking portion 83 holds projection back so that plate 38 is stationary. Thus there is provided a plain ratchet in the lifting movement but cannot be usedin the lowering movement. Thus in the elevating movement the aforesaid prevents the use of pawl 48.

The invention clalmed is:

1. In a chain hoist the combination of .a

' abutment.

2. A device as defined by claim 1, characterized by said housing including a socket in alignment with the elon ated channel portion, and a hook swivela 1y supported in said socket withits axis also in alignment with said elongated channel portion.

-3. In a free chain hoist the combination of a chain, a pinion for operating. said chain, a shaft supporting said pinion, a ratchet supported by said shaft for rotating the same, a ratchet concentric with the shaft and stationary with the housing, a registerable ratchet oscillatably supported adjacent the firstmentioned ratchet, and a handle mechanism associated with the three ratchets.

'4. In a free chain hoist the combination of a chain, a pinion for operating said chain,

t l)v a shaft supporting said pinion, a ratchet supported by said shaft for rotating the same, a ratchet concentric with the shaft and stationary with the housing, a registerable ratchet oscillatably supported adjacent the first mentioned ratchet, and a handle mechanism associated with the three ratchets and adapted to enclose the same.

5. In a free chain hoist the combination of a chain, a pinion for operating said chain, a shaft supporting said pinion, a ratchet .supported by said shaft for rotating the In witnesswhlereof, I have hereunto affixed my signature.

FREDRICK w. ooFFrNG. 

